New York, N.Y. : Scientific American Pub. Co. · leaf 106
96 SCIENTIFIC AMERICAN MONTHLY July, 1921 … each week, this great scientific newspaper gives to the technical and business men the news items of every discovery and achievement in the broad fields of science, mechanics, industry and inventions. For timely information about the activity of inventors, the Scientific American has the…
Technology · Science
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
